Keywords

Strong Gluten Wheat, Water And Nitrogen Coupling, Protein, Starch, Quality

Abstract

Under high fertility conditions, the effects of water-nitrogen coupling on wheat grain yield, protein content and composition, protein quality, starch content and composition, and starch quality were studied. The results showed that regardless of whether nitrogen was applied or not, irrigation significantly increased wheat grain yield, while significantly reducing grain crude protein, monomeric protein and wet gluten content; however, the differences between different irrigation amounts (W1, W2, W3) were not significant. Under the conditions of low irrigation frequency (W0, W1), nitrogen application has an obvious yield-increasing effect; while under high irrigation frequency (W2, W3), the yield-increasing effect of nitrogen application is not significant. As the number of irrigation times increased, the total gluten content remained stable, but the gluten components changed significantly. The soluble gluten content showed an upward trend, and the insoluble gluten content and gluten polymerization index showed a downward trend. Farinograph parameters (formation time and stabilization time) also showed a downward trend. The protein content and components of wheat grains and grain quality were increased to varying degrees by nitrogen application (N.168.kg/hm2), among which the increase in non-gluten proteins (albumin and globulin) was higher than that of gluten proteins (albumin). Soluble protein and glutenin), the increase in soluble glutenin is higher than that in insoluble glutenin, that is, the gluten polymerization index is reduced. There is an obvious interactive effect between water and nitrogen on the starch content and composition of grains. Under the condition of no nitrogen fertilizer, as the number of irrigation increases, the contents of amylopectin and total starch show an upward trend; under the condition of nitrogen application, the total starch and amylopectin contents of each irrigation treatment (W1, W2, W3) are significantly higher than No irrigation treatment (W0), but the difference between each irrigation treatment was not significant. As the number of irrigation times increased, the amylose content and amylose/branch ratio showed a downward trend, and the viscometer indicators (peak viscosity, dilution value, final viscosity and rebound value) all showed an upward trend. Nitrogen fertilization promoted the synthesis of amylopectin and reduced the amylose content and amylose/branch ratio under low irrigation frequency (W0, W1) conditions; the opposite was true under high irrigation frequency (W2, W3) conditions.

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Original research done by Wang Xiaoying, He Mingrong, Li Fei, Liu Yonghuan, Zhang Honghua, Liu Chungang

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